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    2. ASTM A320/A320M Grade B8FA Class 1A

    ASTM A320/A320M Grade B8FA Class 1A Free-Machining Stainless Steel Bolting

    Class 1A Low Temperature Fasteners - AISI 303 Selenium-Bearing Grade

    ASTM A320/A320M Grade B8FA Class 1A is a free-machining austenitic stainless steel bolting grade. Table 3 lists two chemistries for B8F and B8FA: Type 303 (UNS S30300, 0.15 % sulfur minimum) and Type 303Se (UNS S30323, selenium bearing); B8F is the only A320 grade in which selenium may be intentionally added (Table 3 footnote A). Class 1A bolting is carbide solution treated in the finished condition for corrosion resistance, with maximum hardness of 192 HBW or 90 HRB and 75 ksi [515 MPa] minimum tensile strength. Grade B8FA is exempt from impact testing only above -325°F [-200°C] (6.2.1.1), making ASTM A320 Grade B8FA Class 1A suitable for low temperature applications where a free-machining grade is wanted.

    ASTM A320/A320M Grade B8FA Class 1A Properties

    ASTM A320/A320M Grade B8FA Class 1A Chemical Requirements

    Austenitic Steels

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Se
    ASTM A320 B8FA Class 1A S30300(303) Range,% 0.15 2.00 0.20 00.15, min 1.00 8.0 - 10.0 17.0- 19.0 ...
    Product Variation, % Over or Under 0.15 2 0.2 0.06, max 1 8.0-10.0 17.0-19.0 0.15-0.35

    ASTM A320/A320M Grade B8FA Class 1A Mechanical Requirements

    Austenitic Steels

    Grade and Class Diameter, in. [mm] Heat Treatment Tensile Strength, min, ksi [MPa] Yield Strength, min, ksi [MPa] (0.2 % offset) Elongation in 2 in. or 50 mm, min, % Reduction of Area, min, % Hardness, max
    ASTM A320 B8FA Class 1A All diameters carbide solution treated in the  finished condition 75 [515] 30 [205] 30 50 192 HBW or 90  HRB

    Related ASTM A320 pages

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